JPS6212078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing a mounting floor for mounting a Z-type propulsion device in a ship using the Z-type propulsion device.

The Z-type propulsion system, in which the propeller shaft extends vertically from the bottom of the ship, is used on tugboats, ferries, work boats, supply ships, and various other vessels. The top surface of the platform must be cut smooth and an O-ring groove must be formed. Conventionally, in order to construct this pedestal floor, for example, a boring machine was installed inside the ship to cut the top surface (i.e. surface) of the mount floor 2 built into the bottom structure 1 at the stern as shown in FIG. This was used for cutting. 3
is the bottom shell plate, 4 is the rib plate, 5 is the flange plate that reinforces the rib plate, and 6 is the hollow part 7 through which the Z-type propulsion device is inserted.
It is a cylindrical wall plate that forms a. As shown in FIG. 2, the boring machine has a rotating shaft 9 attached with a rotating head 8 having a radius of, for example, about 1.5 m, between an upper bearing pedestal 10 on the upper side of the bottom structure and a lower bearing pedestal on the lower side of the bottom shell plate 3. 11, and this pivot shaft 9 is connected to the drive device 1.
This is a machine with a special structure in which the machine is rotationally driven by 2 and cuts the top surface of the mounting base floor 2 with a cutting tool 13 attached to the end of the swivel head 8, and the equipment for this is a heavy burden on shipyards. Furthermore, it took a considerable amount of time to install the boring machine and cut the surface.

Further, as shown in FIG. 3, a cylindrical wall plate 14,
The annular plate 15 and ribs 18 provided corresponding to each of the ribs 17 of the bottom structure 16 are welded and assembled to form a large platform block 19 (indicated by a solid line), and the upper surface of this platform block 19 is There is also a method in which the platform block 19 is cut into a smooth finish at a machine shop and then brought into the ship and welded to the ship's bottom structure to construct the mounting platform. The block 19 is very large and difficult to machine and transport, and the installation work requires cutting all of the lower ends of the ribs 18 of the base block 19 one by one to fit the shape of the bottom shell 20. It is necessary to align each rib 18 one by one, and it is also necessary to attach each rib 18 to the joining position with each rib 17 accurately, and this installation requires a skilled welding engineer and takes a lot of man-hours. Such,
This was extremely inefficient and required a lot of effort.

This invention was proposed against the above background, and the mounting platform for mounting the Z-type propulsion device can be installed on the bottom of the ship very easily and efficiently without being restricted by the shape of the bottom shell plate and the ribs. The purpose is to obtain a method for constructing

Embodiments of the present invention will be described below with reference to FIGS. 4 to 8.

FIG. 4 is a plan view of the bottom structure at the stern, and the lower half of the drawing shows a cross section taken along the - line in FIG. FIG. 5 is a sectional view taken along the line -- in FIG. 4. Note that this embodiment is of a twin screw propeller type. 21 is a bottom shell plate, 22 is a rib plate, and 23 is a flange plate that reinforces the rib plate 22, and these constitute a bottom structure 24. 26 is the bottom shell plate 21 and the rib plate 22 in alignment with the hole 27 made in the bottom shell plate 21.
A cylindrical wall plate is welded and fixed to the cylindrical wall plate, and a platform body 28 is attached to the upper part of this cylindrical wall plate. 29 indicates a Z-type propulsion device, 29a is a propeller, 29b is an intermediate shaft, 29c
This mechanism has a built-in vertical shaft and gears and transmits power from the vertical shaft to a propeller shaft that rotates the propeller 29a in a horizontal plane.

FIG. 6 is an enlarged view of part A in FIG.
b is a cylindrical member 28 having the same diameter as the cylindrical wall plate 26;
The upper annular plate 28a is welded to the upper and lower parts of the annular plate 28a, and reinforcing ribs 28d are welded to the upper and lower parts of the annular plate 28a.

On the other hand, on the bottom structure 24 side, a stepped portion is formed in advance by cutting out the peripheral edges of the ribs 22 and the cylindrical wall plate 26, and a cylindrical wall plate 26 whose height matches that of the stepped portion is formed in advance.
A receiving portion 30 on which the base body 28 is placed is formed together with the upper surface of the base plate 28 .

Then, the platform body 28 is brought into the ship,
Place it on the receiving part 30, and place it on the cylindrical wall plate 26 and the rib plate 2.
2 and fixed to the flange plate 23 by welding. In this way, a mounting floor is constructed on the bottom structure 24.

Incidentally, the upper annular plate 28a of the platform body 28 is provided with a mounting hole as shown in FIG.
is fixed with a fixture 30 such as a bolt or nut.

When constructing the mounting base floor as described above, the base body 28 includes an upper annular plate 28a, a lower annular plate 28a, and a lower annular plate 28a.
Since it is an assembled structure consisting of the cylindrical member 28c and the ribs 28d, it is lightweight and there is very little welding distortion when welding it to the bottom structure 24.

FIG. 8 shows a second embodiment, in which a flat receiving portion 31 is formed instead of cutting out the ribs to form a stepped portion as in the previous embodiment.
1, a base body 32 substantially similar to the base body 28 of the previous embodiment was mounted and fixed by welding to construct a mounting base. In addition, 32a is an upper annular plate, 32b is a lower annular plate, 32c is a cylindrical member, and 32d is a rib.

In addition, in the above embodiment, the platform bodies 28, 32
Both have an assembled structure made of a plurality of members, but the base body can also be made of a single thick plate member.

As explained above, in the method of the present invention, an annular platform body with a smooth upper surface machined is manufactured, and this is placed on the bottom structure of the ship where the Z-type propulsion device is installed and fixed by welding. The mounting base can be constructed without being affected by the shape of the outer panels or ribs, and since the base is small and lightweight, it is extremely easy to transport and weld to the ship's bottom structure. It is efficient and can save man-hours and shorten the construction period.

[Brief explanation of the drawing]

Figures 1 and 3 are sectional views of main parts of the mounting base floor according to the conventional method, Figure 2 is a sectional view of a boring machine illustrating the conventional method, and Figure 4 is an installation method according to an example of the method of the present invention. A plan view of the bottom structure of the stern showing the platform, Figure 5 is a sectional view taken along the line - in Figure 4, Figure 6 is an enlarged view of section A in Figure 5, and Figure 7 shows the means for attaching the Z-type propulsion device. FIG. 6 is an enlarged view of the main part, and FIG. 8 is a sectional view of the floor of the mounting base showing another embodiment. 21... Bottom shell plate, 22... Rib plate, 24... Bottom structure, 26... Cylindrical wall plate, 27... Hole, 28,
32... Base floor body, 28a, 32a... Upper annular plate, 28b, 32b... Lower annular plate, 28c, 3
2c... Cylindrical member, 28d, 32d... Rib, 3
0,31... Receiving part.

Claims (1)

[Claims] 1. An annular platform body with a smooth upper surface machined is formed, while for the bottom structure, a cylindrical wall plate is installed between the bottom shell plate and the ribs in alignment with the hole drilled in the bottom shell plate through which the Z-type propulsion device passes. At the same time as fixing by welding to
A method for constructing a Z-type propulsion device mounting platform for a ship, in which the platform body is placed on the receiving portion and fixed by welding.